There are a lot of sources for information about insects around the internet. This list is by no means complete, but will allow you to get started finding good information about insects on the internet.
Insect Conservation Organizations:
The Xerces Society focuses on insect conservation issues in the US. They are a great resource for anyone who is interested in insect conservation.
BugLife is the UK equivalent of Xerces. They do great insect conservation work.
Entomology (Facebook Page)
Group dedicated to photography and insect identification. Many knowledgeable amateur and professional entomologists are members.
Web repository of insect pictures and location information. Information about insects, including taxonomic traits, biological quirks, etc is present.
Nancy Miorelli’s YouTube includes a number of video tutorials about insect biology, identification and techniques used to work with insects. If you use any of the keys below, this is an excellent place to start learning about morphology.
Beetles in the Bush
Blog run by Entomologist Ted MacRae, which encompasses far more than just beetles
Biodiversity in Focus
Blog run by fly taxonomist Morgan Jackson
Blog run by Eric Eaton in which he discusses insect biology, behavior, and identification.
Blog run by Andrea Haberkern about spiders, research, and day to day life as an entomologist.
Blog run by Gwen Pearson, one of the best known blogs in the entomoblogosphere
Blog run by Alex Wild, who is a well known ant taxonomist and photographer
New blog run by a large number of undergraduates covering ento news
How to take care of your pet tarantulas.
Online keys devoted to insects which live in water.
Beetles of the World
Online identification of beetles.
CDC Environmental Health Services Keys to Arthropods, Reptiles, Birds and Mammals of medical significance.
Contains a variety of keys to different taxa which are known to spread diseases of medical and veterinary importance in the United States. Commonly used in medical entomology classes as teaching tools; may be out of date.
Keys to a wide range of insects, many of which are open-access.
Embioptera family keys.
Contains keys to families of Webspinners.
Entomological Society of Canada
Maintains keys relevant to identification of insects in Canada
Hymenoptera of the World
Keys to the families of Hymenoptera
Manual of Afrotropical Diptera (Currently Unpublished)
When published, these keys will assist in the identification of flies in tropical Africa.
Insectos Inmaduros: Metamorfosis e Identificación
Tiene muchas ordenes de insectos y describe biología y identificación. Puedes descargar todos PDFs.
Walter Reed Biosystematics Unit
Provides keys to mosquitoes for the entire world, as well as other taxonomic, identification and distribution resources. Keys are tricky to use, and need to be added as security exception in JAVA…but they do work.
Miridae (Seed Bugs) of Texas
Pictorial guide of common Miridae based on BugGuide.